Test: Arithmetic Series - Ambitious

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Question 1:   What is the common difference in the following arithmetic series: 2.5,6.4,10.3,... ?
2.56
3.2
3.9
7.8
Question 2:   Which of the following sequences is an arithmetic series?
0.125,0.250,0.38,0.515,0.655
1,2,3,5,8,13
16,8,4,2,1
17.5,15,12.5,10,7.5
Question 3:   What is the 25 th term in the following arithmetic series: 1,4,7,10... ?
75
73
74
72
Question 4:   What is the 31 st term in the following arithmetic series: 45,42.5,40... ?
30
31.75
27.25
110
Question 5:   What is the sum of the first 21 terms in the following arithmetic series: 3,5,7,9 ?
S 21 =512
S 21 =241
S 21 =483
S 21 =368
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